You are experimenting with a binary in /tmp/foo.d that expects its configuration file at /etc/foo.conf. You don't want to save it there, but use a symbolic link to /tmp/foo.d/foo.conf instead. Which command would accomplish that?
ln -s /tmp/foo.d/foo.conf /etc/foo.conf
ln /tmp/foo.d/foo.conf /etc/foo.conf
ln -s /etc/foo.conf /tmp/foo.d/foo.conf
ln /etc/foo.conf /tmp/foo.d/foo.conf
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